Struct EngineConfig 

pub struct EngineConfig {
    pub write_period_secs: u64,
    pub policy_file: Option<PathBuf>,
    pub server_ioc_drift_secs: u64,
    pub write_shards: usize,
    pub per_shard_buffer: usize,
}

EPICS CA engine configuration.

Fields

write_period_secs: u64

Write period in seconds — how often buffered samples flush to storage.

policy_file: Option<PathBuf>

Path to PV policy TOML file.

server_ioc_drift_secs: u64

Maximum allowed drift between IOC-reported sample timestamps and the appliance’s wall clock, in either direction (Java parity 6538631 — org.epics.archiverappliance.engine.epics.SERVER_IOC_DRIFT_SECONDS). Default 30 minutes; set higher for known-skewed sites without recompiling.

write_shards: usize

Number of parallel write-loop shards. 1 (the default) keeps the legacy single-worker layout. Sites with many active PVs and a fast STS can raise this to e.g. 4–16; the engine spawns a dispatcher that hashes pv_name to a fixed shard so per-PV ordering is preserved while different PVs can append concurrently.

per_shard_buffer: usize

Per-shard mpsc capacity. Only consulted when `write_shards

1. The dispatcher try_sends into each shard channel — when a shard is saturated its overflow is dropped and recorded on the per-PV buffer_overflow_drops` counter, while OTHER shards keep flowing (per-shard isolation).

Trait Implementations

impl Clone for EngineConfig

fn clone(&self) -> EngineConfig

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for EngineConfig

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for EngineConfig

fn default() -> EngineConfig

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for EngineConfig

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Serialize for EngineConfig

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.